Kikkou T, Matsumoto O, Ohkubo T, Kobayashi Y, Tsujimoto G. NMR structure of a human homologous methuselah gene receptor peptide.
Biochem Biophys Res Commun 2006;
352:17-20. [PMID:
17109822 DOI:
10.1016/j.bbrc.2006.10.140]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Accepted: 10/23/2006] [Indexed: 10/23/2022]
Abstract
Human APG1 gene is homologous to Drosophila methuselah gene associated with extended life span. A peptide (APG1: RNGKRSNRTLREE) corresponding to a predicted region of the intracellular third loop of G protein-coupled receptor coded in human APG1 gene could activate Gi protein alpha subunit directly. The three-dimensional molecular structure of the peptide in SDS-d25 micelles was determined by 2D 1H NMR spectroscopy. APG1 formed an alpha-helical structure at the C-terminal site and a positive charge cluster at the N-terminal site. The cluster was also found in several other Gi protein-coupled receptor peptides. Therefore, the positive charge cluster on the helical structure might be engaged in G protein activation.
Collapse